CN112500019A - Non-hygroscopic efficient gypsum retarder and preparation method and application thereof - Google Patents
Non-hygroscopic efficient gypsum retarder and preparation method and application thereof Download PDFInfo
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- CN112500019A CN112500019A CN202011406695.5A CN202011406695A CN112500019A CN 112500019 A CN112500019 A CN 112500019A CN 202011406695 A CN202011406695 A CN 202011406695A CN 112500019 A CN112500019 A CN 112500019A
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- gypsum
- retarder
- efficiency
- gypsum retarder
- calcium polyaspartate
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B40/00—Processes, in general, for influencing or modifying the properties of mortars, concrete or artificial stone compositions, e.g. their setting or hardening ability
- C04B40/0028—Aspects relating to the mixing step of the mortar preparation
- C04B40/0039—Premixtures of ingredients
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B2103/00—Function or property of ingredients for mortars, concrete or artificial stone
- C04B2103/20—Retarders
- C04B2103/22—Set retarders
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
- Y02W30/00—Technologies for solid waste management
- Y02W30/50—Reuse, recycling or recovery technologies
- Y02W30/91—Use of waste materials as fillers for mortars or concrete
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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Ceramic Engineering (AREA)
- Materials Engineering (AREA)
- Structural Engineering (AREA)
- Organic Chemistry (AREA)
- Compounds Of Alkaline-Earth Elements, Aluminum Or Rare-Earth Metals (AREA)
- Compositions Of Macromolecular Compounds (AREA)
- Curing Cements, Concrete, And Artificial Stone (AREA)
Abstract
The invention belongs to the technical field of gypsum building materials, and particularly relates to a non-hygroscopic high-efficiency gypsum retarder as well as a preparation method and application thereof. The high-efficiency gypsum retarder is prepared by compounding calcium polyaspartate, barium hydroxide and barium carbonate according to the proportion, and the obtained product can achieve a good retarding effect under a small addition amount, is not easy to absorb moisture, and is more convenient to operate in the using process. According to the preparation method, the calcium polyaspartate, the barium hydroxide and the barium carbonate are mixed and ground for a certain time, the obtained product is not easy to absorb moisture, has a high-efficiency slow setting effect, can achieve a good slow setting effect even if being used for the phosphogypsum with a relatively small addition amount, and can be used as a phosphogypsum retarder.
Description
Technical Field
The invention belongs to the technical field of gypsum building materials, and particularly relates to a non-hygroscopic high-efficiency gypsum retarder as well as a preparation method and application thereof.
Background
The gypsum building material has the advantages of light material, small deformation, stable size, difficult cracking during drying and the like, is widely applied to the production of plastering mortar, decorative plates, putty and building blocks, and has wide market space.
However, gypsum can be quickly set and hardened when meeting water, the working time is as short as several minutes, and the working time is as long as more than ten minutes, so that the application of the gypsum is greatly limited. Currently, gypsum retarders are typically added during construction to delay the workable time of the gypsum-based material. The gypsum retarder commonly used in the market mainly comprises organic acid (citric acid, tartaric acid and the like) and soluble salts thereof, alkaline phosphate and hydrolyzed protein. The organic acid and the soluble salt thereof have low price and small relative addition amount, but can cause the strength of the gypsum product to be obviously reduced; the problem of strength loss cannot be avoided by alkaline phosphates; although the hydrolyzed protein has little influence on the strength of the gypsum, the addition amount is large, the cost of the gypsum product is indirectly increased, the problem of moisture absorption exists, and a lot of inconvenience is caused in the storage and use processes. Moreover, when the hydrolyzed protein macromolecular compound is used as a gypsum retarder, the retarding effect is greatly influenced by gypsum sources, and most of the hydrolyzed protein macromolecular compound has good application performance in desulfurized gypsum, but the retarding effect in phosphogypsum is poor, so that the application range of the hydrolyzed protein macromolecular compound as the gypsum retarder is limited.
Disclosure of Invention
Aiming at the technical problems of large addition amount, easy moisture absorption and poor retarding effect in phosphogypsum of the conventional hydrolyzed protein gypsum retarder, the invention provides a non-moisture-absorption high-efficiency gypsum retarder and a preparation method and application thereof.
In order to achieve the purpose of the invention, the embodiment of the invention adopts the following technical scheme:
in a first aspect, the embodiment of the present invention provides a moisture-free high-efficiency gypsum retarder, which includes (80-90) by mass, (5-10) by mass, calcium polyaspartate, barium hydroxide and barium carbonate.
Tests show that the gypsum retarder prepared by compounding the calcium polyaspartate, the barium hydroxide and the barium carbonate according to the proportion can achieve good retarding effect under the condition of small addition amount, is not easy to absorb moisture, and is more convenient to operate in the using process.
Preferably, the mass ratio of the calcium polyaspartate to the barium hydroxide to the barium carbonate is (82-88): (6-8): (6-8).
Preferably, the mass ratio of the calcium polyaspartate to the barium hydroxide to the barium carbonate is 85:7.5: 7.5.
In a second aspect, the embodiments of the present invention provide a method for preparing the above-mentioned non-hygroscopic high-efficiency gypsum retarder, which includes the following operations: and weighing the calcium polyaspartate, the barium hydroxide and the barium carbonate according to the proportion, and mixing and grinding for 30-60 min to obtain the non-hygroscopic high-efficiency gypsum retarder.
According to the preparation method, the calcium polyaspartate, the barium hydroxide and the barium carbonate are mixed and ground for a specific time, and the obtained product is not easy to absorb moisture and has a high-efficiency slow-setting effect. The mechanism is presumed to be: the barium hydroxide and the barium carbonate are uniformly dispersed among calcium polyaspartate molecules by mixing and grinding at a specific time, so that on one hand, agglomeration of the calcium polyaspartate is hindered to prevent the calcium polyaspartate from absorbing moisture, and on the other hand, the interference of the calcium polyaspartate on the formation process of a crystal structure net of gypsum slurry is enhanced by the barium hydroxide and the barium carbonate, and therefore, the prepared product can achieve a good retarding effect at a relatively low dosage.
Preferably, the particle size of the calcium polyaspartate is 0.15-0.20 mm.
Preferably, the particle size of the barium hydroxide is 0.09-0.12 mm;
the particle size of the barium carbonate is 0.09-0.12 mm.
The barium hydroxide and the barium carbonate with the particle sizes can ensure that the obtained product is less prone to moisture absorption and has a better delayed coagulation effect.
In a third aspect, the embodiment of the invention also provides an application of the non-hygroscopic high-efficiency gypsum retarder as a phosphogypsum retarder, wherein the non-hygroscopic high-efficiency gypsum retarder is added into gypsum, and the addition amount of the non-hygroscopic high-efficiency gypsum retarder is 0.01-0.20% of the total weight of the gypsum. Compared with the prior art, the high-efficiency gypsum retarder provided by the invention can exert a good retarding effect only by adopting 0.01-0.20% of addition amount in phosphogypsum, so that the high-efficiency gypsum retarder can be used as a phosphogypsum retarder.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is further described in detail with reference to the following embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
Example 1
The embodiment provides a moisture-proof high-efficiency gypsum retarder which is prepared from calcium polyaspartate, barium hydroxide and barium carbonate in a mass ratio of 85:7.5: 7.5. The preparation method comprises the following steps:
weighing calcium polyaspartate with the particle size of 0.15-0.20 mm, barium hydroxide with the particle size of 0.09-0.12 mm and barium carbonate with the particle size of 0.09-0.12 mm according to the proportion, and mixing and grinding for 45min to obtain the calcium polyaspartate.
Example 2
The embodiment provides a non-hygroscopic high-efficiency gypsum retarder which is prepared from calcium polyaspartate, barium hydroxide and barium carbonate in a mass ratio of 88:6: 6. The preparation method comprises the following steps:
weighing calcium polyaspartate with the particle size of 0.15-0.20 mm, barium hydroxide with the particle size of 0.09-0.12 mm and barium carbonate with the particle size of 0.09-0.12 mm according to the proportion, and mixing and grinding for 40min to obtain the calcium polyaspartate.
Example 3
The embodiment provides a non-hygroscopic high-efficiency gypsum retarder which is prepared from calcium polyaspartate, barium hydroxide and barium carbonate in a mass ratio of 82:8: 8. The preparation method comprises the following steps:
weighing calcium polyaspartate with the particle size of 0.15-0.20 mm, barium hydroxide with the particle size of 0.09-0.12 mm and barium carbonate with the particle size of 0.09-0.12 mm according to the proportion, and mixing and grinding for 50min to obtain the calcium polyaspartate.
Example 4
The embodiment provides a non-hygroscopic high-efficiency gypsum retarder which is prepared from calcium polyaspartate, barium hydroxide and barium carbonate in a mass ratio of 90:5: 5. The preparation method comprises the following steps:
weighing calcium polyaspartate with the particle size of 0.15-0.20 mm, barium hydroxide with the particle size of 0.09-0.12 mm and barium carbonate with the particle size of 0.09-0.12 mm according to the proportion, and mixing and grinding for 30min to obtain the calcium polyaspartate.
Example 5
The embodiment provides a non-hygroscopic high-efficiency gypsum retarder which is prepared from calcium polyaspartate, barium hydroxide and barium carbonate in a mass ratio of 80:10: 10. The preparation method comprises the following steps:
weighing calcium polyaspartate with the particle size of 0.15-0.20 mm, barium hydroxide with the particle size of 0.09-0.12 mm and barium carbonate with the particle size of 0.09-0.12 mm according to the proportion, and mixing and grinding for 60min to obtain the calcium polyaspartate.
Example 6
The embodiment provides the application of the non-hygroscopic high-efficiency gypsum retarder obtained in the above embodiments 1 to 5 in phosphogypsum retarding.
The non-hygroscopic high efficiency gypsum retarder prepared from examples 1-5 was added to phosphogypsum in amounts (on a dry basis) of 0.01%, 0.05%, 0.10%, 0.15%, 0.20% of the total weight of gypsum. The initial setting time, the time difference between initial setting and final setting and the strength performance of the obtained phosphogypsum are respectively considered under the condition of the same batch of gypsum (the water consumption of the standard consistency is 60%). Phosphogypsum without added gypsum retarder was used as a blank control. The results are shown in tables 1 to 5.
TABLE 1 retarding effect and Gypsum Strength Properties (Gypsum retarder add 0.01%)
TABLE 2 retarding effect and Gypsum Strength Properties (Gypsum retarder add 0.05%)
TABLE 3 retarding effect and Gypsum Strength Properties (Gypsum retarder add 0.10%)
TABLE 4 retarding effect and Gypsum Strength Properties (Gypsum retarder add 0.15%)
TABLE 5 retarding effect and Gypsum Strength Properties (Gypsum retarder add 0.20%)
Comparative example 1
The comparative example provides a gypsum retarder, which is prepared from calcium polyaspartate and barium hydroxide in a mass ratio of 85: 15. The preparation method comprises the following steps:
weighing calcium polyaspartate with the particle size of 0.15-0.20 mm and barium hydroxide with the particle size of 0.09-0.12 mm according to the proportion, and mixing and grinding for 45min to obtain the calcium polyaspartate.
Comparative example 2
The comparative example provides a gypsum retarder prepared from calcium polyaspartate and barium carbonate in a mass ratio of 85: 15. The preparation method comprises the following steps:
weighing calcium polyaspartate with the particle size of 0.15-0.20 mm and barium carbonate with the particle size of 0.09-0.12 mm according to the proportion, and mixing and grinding for 45min to obtain the calcium polyaspartate.
Comparative example 3
The comparative example provides a gypsum retarder, prepared from calcium polyaspartate, calcium hydroxide and barium carbonate in a mass ratio of 85:7.5: 7.5. The preparation method comprises the following steps:
weighing calcium polyaspartate with the particle size of 0.15-0.20 mm, calcium hydroxide with the particle size of 0.09-0.12 mm and barium carbonate with the particle size of 0.09-0.12 mm according to the proportion, and mixing and grinding for 45min to obtain the calcium polyaspartate.
Comparative example 4
The comparative example provides a gypsum retarder prepared from calcium polyaspartate, barium hydroxide, and calcium carbonate in a mass ratio of 85:7.5: 7.5. The preparation method comprises the following steps:
weighing calcium polyaspartate with the particle size of 0.15-0.20 mm, barium hydroxide with the particle size of 0.09-0.12 mm and calcium carbonate with the particle size of 0.09-0.12 mm according to the proportion, and mixing and grinding for 45min to obtain the calcium polyaspartate.
Comparative example 5
The comparative example provides a gypsum retarder, which is prepared from calcium polyaspartate, barium hydroxide and barium carbonate in a mass ratio of 76:12: 12. The preparation method comprises the following steps:
weighing calcium polyaspartate with the particle size of 0.15-0.20 mm, barium hydroxide with the particle size of 0.09-0.12 mm and barium carbonate with the particle size of 0.09-0.12 mm according to the proportion, and mixing and grinding for 45min to obtain the calcium polyaspartate.
Comparative example 6
The comparative example provides a gypsum retarder, which is prepared from calcium polyaspartate, barium hydroxide and barium carbonate in a mass ratio of 92:4: 4. The preparation method comprises the following steps:
weighing calcium polyaspartate with the particle size of 0.15-0.20 mm, barium hydroxide with the particle size of 0.09-0.12 mm and barium carbonate with the particle size of 0.09-0.12 mm according to the proportion, and mixing and grinding for 45min to obtain the calcium polyaspartate.
Comparative example 7
The comparative example provides the moisture absorption of the gypsum retarder obtained in the comparative examples 1-6 and the application of the calcium polyaspartate alone in the phosphogypsum retardation.
The gypsum retarder obtained in comparative examples 1-6 and the separately used calcium polyaspartate were added to phosphogypsum in amounts (on a dry basis) of 0.01%, 0.05%, 0.10%, 0.15%, 0.20% of the total weight of gypsum, respectively. The initial setting time, the time difference between initial setting and final setting and the strength performance of the obtained phosphogypsum are respectively considered under the condition of the same batch of gypsum (the water consumption of the standard consistency is 60%). Phosphogypsum without added gypsum retarder was used as a blank control. The results are shown in tables 6 to 10.
TABLE 6 retarding effect and Gypsum Strength Properties (Gypsum retarder add 0.01%)
TABLE 7 retarding effect and Gypsum Strength Properties (Gypsum retarder add 0.05%)
TABLE 8 retarding effect and Gypsum Strength Properties (Gypsum retarder add 0.10%)
TABLE 9 retarding effect and Gypsum Strength Properties (Gypsum retarder add 0.15%)
TABLE 10 retarding effect and Gypsum Strength Properties (Gypsum retarder add 0.20%)
As can be seen from tables 6-10, when the barium hydroxide or the barium sulfate is removed or replaced, the material proportion is changed, the mixing and grinding time is changed, or the calcium polyaspartate is singly used, the retarding effect of the obtained gypsum retarder on the phosphogypsum is obviously reduced.
Test examples
In the test example, the moisture absorption performance of the products prepared in the examples 1 to 5 and the comparative examples 1 to 6 and the calcium polyaspartate is examined:
weighing about 10g of sample to be measured into a weighing container, accurately weighing to 0.0001g, placing in a constant temperature and humidity box with 50 +/-1 ℃ and 50% +/-2% relative humidity, continuously placing for 7 days, recording the weight, and calculating the weight gain. The results are shown in Table 11.
TABLE 11 moisture absorption Performance examination
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents or improvements made within the spirit and principle of the present invention should be included in the scope of the present invention.
Claims (8)
1. A non-hygroscopic high-efficiency gypsum retarder is characterized by comprising 80-90 wt% to 5-10 wt% of calcium polyaspartate, 5-10 wt% of barium hydroxide and 5-10 wt% of barium carbonate.
2. The non-hygroscopic high-efficiency gypsum retarder according to claim 1, wherein the mass ratio of the calcium polyaspartate, the barium hydroxide and the barium carbonate is (82-88): (6-8): (6-8).
3. The non-hygroscopic high-efficiency gypsum retarder according to claim 1, wherein the mass ratio of the calcium polyaspartate, the barium hydroxide and the barium carbonate is 85:7.5: 7.5.
4. The method for preparing the non-hygroscopic high-efficiency gypsum retarder as claimed in any one of claims 1 to 3, which is characterized by comprising the following operations: and weighing the calcium polyaspartate, the barium hydroxide and the barium carbonate according to the proportion, and mixing and grinding for 30-60 min to obtain the non-hygroscopic high-efficiency gypsum retarder.
5. The method for preparing the non-hygroscopic high-efficiency gypsum retarder according to claim 4, wherein the particle size of the calcium polyaspartate is 0.15-0.20 mm.
6. The method for preparing the non-hygroscopic high-efficiency gypsum retarder according to claim 5, wherein the particle size of the barium hydroxide is 0.09-0.12 mm.
7. The method for preparing the non-hygroscopic high-efficiency gypsum retarder according to claim 5, wherein the particle size of the barium carbonate is 0.09-0.12 mm.
8. The application of the non-hygroscopic high-efficiency gypsum retarder as the phosphogypsum retarder according to any one of claims 1 to 3 is characterized in that the non-hygroscopic high-efficiency gypsum retarder is added into gypsum in an amount of 0.01 to 0.20 percent of the total weight of the gypsum.
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| CN202011406695.5A CN112500019B (en) | 2020-12-04 | 2020-12-04 | Moisture-proof high-efficiency phosphogypsum retarder as well as preparation method and application thereof |
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| CN202011406695.5A CN112500019B (en) | 2020-12-04 | 2020-12-04 | Moisture-proof high-efficiency phosphogypsum retarder as well as preparation method and application thereof |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115028380A (en) * | 2022-06-28 | 2022-09-09 | 河北协同环保科技股份有限公司 | Retarder composition for gypsum calcination |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE10127060A1 (en) * | 2001-06-02 | 2002-12-05 | Henkel Kgaa | The use of carboxyl group containing polymers selected from polymerized amino acids, carboxyl group substituted polysaccharides, and modified polyacrylates useful in the building industry for retarding the setting of gypsum |
| CN104724966A (en) * | 2015-03-12 | 2015-06-24 | 东南大学 | High-strength gypsum retarder and preparation method thereof |
| CN109867479A (en) * | 2019-04-10 | 2019-06-11 | 北京博润佳科技有限公司 | A kind of polymeric amino acid class calcium sulphate retarder |
-
2020
- 2020-12-04 CN CN202011406695.5A patent/CN112500019B/en active Active
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE10127060A1 (en) * | 2001-06-02 | 2002-12-05 | Henkel Kgaa | The use of carboxyl group containing polymers selected from polymerized amino acids, carboxyl group substituted polysaccharides, and modified polyacrylates useful in the building industry for retarding the setting of gypsum |
| CN104724966A (en) * | 2015-03-12 | 2015-06-24 | 东南大学 | High-strength gypsum retarder and preparation method thereof |
| CN109867479A (en) * | 2019-04-10 | 2019-06-11 | 北京博润佳科技有限公司 | A kind of polymeric amino acid class calcium sulphate retarder |
Non-Patent Citations (3)
| Title |
|---|
| 汪多仁: "《绿色净水处理剂》", 30 November 2006, 科学技术文献出版社 * |
| 赵云龙: "《石膏应用技术问答》", 30 September 2016, 中国建材工业出版社 * |
| 郭京育等: "《聚羧酸系高性能减水剂制备、性能与应用技术新进展 第六届混凝土外加剂应用技术专业委员会年会》", 31 May 2013, 北京理工大学出版社 * |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115028380A (en) * | 2022-06-28 | 2022-09-09 | 河北协同环保科技股份有限公司 | Retarder composition for gypsum calcination |
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